Zarine Khan (right) and Shafi Khan, parents of Mohammed Hamzah Khan, speak to reporters in Chicago Oct. 9 after a federal hearing for their 19-year-old son, accused of trying to join Islamic State militants in Syria. Charles Rex Arbogast/AP hide caption

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Nobel Prize-winning physicist Charles Townes was single-minded about a lot of things, colleagues say. And also a very nice guy. Julian Wasser/The LIFE Images Collection/Getty hide caption

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Emily Neblett, a patient at the Monroe Carell Jr. Children's Hospital in Nashville, Tenn., demonstrates circuit pieces from the mobile maker space that are connected by magnets. Noah Nelson/Youth Radio hide caption

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Leah Bannon (sitting) works on her laptop at 18F, a GSA project that aims to make government websites more user friendly and change the way government buys IT systems. Emily Jan/NPR hide caption

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Joe Clayton, president and CEO of Dish Network, introduces the Sling TV earlier this month at the International Consumer Electronics Show in Las Vegas. Jae C. Hong/AP hide caption

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The Secret Service released this photo of a "quad copter" that crashed on the White House grounds Monday. The agency says the copter's operator reported crashing it this morning. Secret Service hide caption

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Allison Begalman, a student at the University of Southern California, wears goggles and headphones to experience a virtual mortar strike on civilians in Aleppo, Syria. James Delahoussaye/NPR hide caption

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